Preference with Confirm Dialog

Question

I am having a hard time making a Preference with Dialog, none of the methods suggested in the site works for me. So here is what I have first. In MainActivity I have this

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_stage_1, menu);
    return true;
}

This opens the menu, and when you choose Settings, in the next screen there is only one preference, created from this preferences.xml

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

<Preference
    android:summary="clears all data"
    android:title="Reset Data" >
    <intent
        android:targetClass="com.example.myapp.settings.DialogActivity"
        android:targetPackage="com.example.myapp" >
    </intent>
</Preference>

I want when I click this option, a dialog to appear with Yes and No button, so I ca define somewhere what the buttons will do programatically. How can I do it?

Answer 1

You can extend the DialogPreference. Override the onDialogClosed method, which is called when the Dialog closes. The argument to the method indicates whether user selected positive or negative button.

CustomDialogPreference.java :

    public class CustomDialogPreference extends DialogPreference {
        public CustomDialogPreference(Context context, AttributeSet attrs) {
            super(context, attrs);

            // Set the layout here                
            setDialogLayoutResource(R.layout.custom_dialog);

            setPositiveButtonText(android.R.string.ok);
            setNegativeButtonText(android.R.string.cancel);

            setDialogIcon(null);
        }

        @Override
        protected void onDialogClosed(boolean positiveResult) {
            // When the user selects "OK", persist the new value
            if (positiveResult) {
                // User selected OK
            } else {
                // User selected Cancel
            }
        }

    }

preferences.xml

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
    <com.example.test1.CustomDialogPreference
        android:key="pref_dialog"
        android:title="dialog"/>
</PreferenceScreen>

You can refer the official Settings documentation.